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2023 Cultural Resource Site Assessments for Collom Expansion Project Colowyo <br />Tetra Tech June 2023 11 <br />For Official Use Only: Disclosure of Site Locations Prohibited (43 CFR 7.18) <br />mining activities but continues to be affected by natural erosion as reported in 2015. Vegetation <br />growing on the site had reduced ground surface visibility and the original datum was not relocated. <br />None of the previously reported cultural material, including bone and charcoal staining, was <br />relocated due to the dense vegetation growth. <br />In 2023, Tetra Tech revisited the site as part of the third round of assessments (Figure 6). The <br />site has not been adversely affected by mining activities. Like the 2019 revisit, Tetra Tech did not <br />relocate documented cultural material including the bone or charcoal staining. A small snow drift <br />also remained in the wash bottom; but was not extensive enough to preclude sufficient visibility <br />for the revisit. A section of the wash cut bank has naturally slumped into the wash (Figure 7). No <br />cultural resources were observed in the sediments exposed by the slump. The slump event has <br />not adversely affected the site. Tetra Tech recommends that mining activities continue to avoid <br />the site until further assessment is completed to fully evaluated the site’s NRHP eligibility. <br />NRHP Status and Condition Assessment <br />In 1995, Site 5MF.3996 was recommended as needing more data to determine its potential for <br />inclusion on the NRHP. TRC agreed with this recommendation in 2005. Both recordings argue <br />that the site requires subsurface testing to determine if the faunal remains and staining are both <br />cultural in origin and part of an intact subsurface cultural component. Tetra Tech agrees with the <br />previous recommendations. Since 2019 a part of the wash bank has naturally slumped into the <br />wash. No artifacts or other cultural material were observed in the sediments exposed by the wash; <br />therefore, the impact from the slump is considered minimal. Overall site integrity remains <br />unchanged from the 2019 recordation. The site should continue to be avoided pending additional <br />subsurface testing to determine whether subsurface cultural material is present at the site. <br /> <br />Figure 6. Site 5MF.3996 overview, facing southeast. Taken by E. Shikrallah on 5/17/2023.